Examine source code of Quick Translate v3

{
  "manifest_version": 2,
  "name": "Quick Translate",
  "version": "1.0",
  "description": "Quickly translate selected text on webpages.",
  "icons": {
    "48": "icons/translate-icon-48.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/translate-icon-48.png",
    "default_popup": "translate-popup.html",
    "default_title": "Quick Translate"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e913d1e7-ec17-423e-b40f-06bafb396a89}"
    }
  }
}